1 //===- LibDriver.cpp - lib.exe-compatible driver --------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Defines an interface to a lib.exe-compatible driver that also understands 11 // bitcode files. Used by llvm-lib and lld-link /lib. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/ToolDrivers/llvm-lib/LibDriver.h" 16 #include "llvm/ADT/STLExtras.h" 17 #include "llvm/BinaryFormat/Magic.h" 18 #include "llvm/Object/ArchiveWriter.h" 19 #include "llvm/Option/Arg.h" 20 #include "llvm/Option/ArgList.h" 21 #include "llvm/Option/Option.h" 22 #include "llvm/Support/CommandLine.h" 23 #include "llvm/Support/Path.h" 24 #include "llvm/Support/Process.h" 25 #include "llvm/Support/StringSaver.h" 26 #include "llvm/Support/raw_ostream.h" 27 28 using namespace llvm; 29 30 namespace { 31 32 enum { 33 OPT_INVALID = 0, 34 #define OPTION(_1, _2, ID, _4, _5, _6, _7, _8, _9, _10, _11) OPT_##ID, 35 #include "Options.inc" 36 #undef OPTION 37 }; 38 39 #define PREFIX(NAME, VALUE) const char *const NAME[] = VALUE; 40 #include "Options.inc" 41 #undef PREFIX 42 43 static const llvm::opt::OptTable::Info infoTable[] = { 44 #define OPTION(X1, X2, ID, KIND, GROUP, ALIAS, X6, X7, X8, X9, X10) \ 45 { \ 46 X1, X2, X9, X10, OPT_##ID, llvm::opt::Option::KIND##Class, X8, X7, \ 47 OPT_##GROUP, OPT_##ALIAS, X6 \ 48 }, 49 #include "Options.inc" 50 #undef OPTION 51 }; 52 53 class LibOptTable : public llvm::opt::OptTable { 54 public: 55 LibOptTable() : OptTable(infoTable, true) {} 56 }; 57 58 } 59 60 static std::string getOutputPath(llvm::opt::InputArgList *Args, 61 const llvm::NewArchiveMember &FirstMember) { 62 if (auto *Arg = Args->getLastArg(OPT_out)) 63 return Arg->getValue(); 64 SmallString<128> Val = StringRef(FirstMember.Buf->getBufferIdentifier()); 65 llvm::sys::path::replace_extension(Val, ".lib"); 66 return Val.str(); 67 } 68 69 static std::vector<StringRef> getSearchPaths(llvm::opt::InputArgList *Args, 70 StringSaver &Saver) { 71 std::vector<StringRef> Ret; 72 // Add current directory as first item of the search path. 73 Ret.push_back(""); 74 75 // Add /libpath flags. 76 for (auto *Arg : Args->filtered(OPT_libpath)) 77 Ret.push_back(Arg->getValue()); 78 79 // Add $LIB. 80 Optional<std::string> EnvOpt = sys::Process::GetEnv("LIB"); 81 if (!EnvOpt.hasValue()) 82 return Ret; 83 StringRef Env = Saver.save(*EnvOpt); 84 while (!Env.empty()) { 85 StringRef Path; 86 std::tie(Path, Env) = Env.split(';'); 87 Ret.push_back(Path); 88 } 89 return Ret; 90 } 91 92 static Optional<std::string> findInputFile(StringRef File, 93 ArrayRef<StringRef> Paths) { 94 for (auto Dir : Paths) { 95 SmallString<128> Path = Dir; 96 sys::path::append(Path, File); 97 if (sys::fs::exists(Path)) 98 return Path.str().str(); 99 } 100 return Optional<std::string>(); 101 } 102 103 int llvm::libDriverMain(llvm::ArrayRef<const char*> ArgsArr) { 104 SmallVector<const char *, 20> NewArgs(ArgsArr.begin(), ArgsArr.end()); 105 BumpPtrAllocator Alloc; 106 StringSaver Saver(Alloc); 107 cl::ExpandResponseFiles(Saver, cl::TokenizeWindowsCommandLine, NewArgs); 108 ArgsArr = NewArgs; 109 110 LibOptTable Table; 111 unsigned MissingIndex; 112 unsigned MissingCount; 113 llvm::opt::InputArgList Args = 114 Table.ParseArgs(ArgsArr.slice(1), MissingIndex, MissingCount); 115 if (MissingCount) { 116 llvm::errs() << "missing arg value for \"" 117 << Args.getArgString(MissingIndex) << "\", expected " 118 << MissingCount 119 << (MissingCount == 1 ? " argument.\n" : " arguments.\n"); 120 return 1; 121 } 122 for (auto *Arg : Args.filtered(OPT_UNKNOWN)) 123 llvm::errs() << "ignoring unknown argument: " << Arg->getSpelling() << "\n"; 124 125 if (!Args.hasArgNoClaim(OPT_INPUT)) { 126 // No input files. To match lib.exe, silently do nothing. 127 return 0; 128 } 129 130 std::vector<StringRef> SearchPaths = getSearchPaths(&Args, Saver); 131 132 std::vector<llvm::NewArchiveMember> Members; 133 for (auto *Arg : Args.filtered(OPT_INPUT)) { 134 Optional<std::string> Path = findInputFile(Arg->getValue(), SearchPaths); 135 if (!Path.hasValue()) { 136 llvm::errs() << Arg->getValue() << ": no such file or directory\n"; 137 return 1; 138 } 139 Expected<NewArchiveMember> MOrErr = 140 NewArchiveMember::getFile(Saver.save(*Path), /*Deterministic=*/true); 141 if (!MOrErr) { 142 handleAllErrors(MOrErr.takeError(), [&](const llvm::ErrorInfoBase &EIB) { 143 llvm::errs() << Arg->getValue() << ": " << EIB.message() << "\n"; 144 }); 145 return 1; 146 } 147 llvm::file_magic Magic = llvm::identify_magic(MOrErr->Buf->getBuffer()); 148 if (Magic != llvm::file_magic::coff_object && 149 Magic != llvm::file_magic::bitcode && 150 Magic != llvm::file_magic::windows_resource) { 151 llvm::errs() << Arg->getValue() 152 << ": not a COFF object, bitcode or resource file\n"; 153 return 1; 154 } 155 Members.emplace_back(std::move(*MOrErr)); 156 } 157 158 std::pair<StringRef, std::error_code> Result = 159 llvm::writeArchive(getOutputPath(&Args, Members[0]), Members, 160 /*WriteSymtab=*/true, object::Archive::K_GNU, 161 /*Deterministic*/ true, Args.hasArg(OPT_llvmlibthin)); 162 163 if (Result.second) { 164 if (Result.first.empty()) 165 Result.first = ArgsArr[0]; 166 llvm::errs() << Result.first << ": " << Result.second.message() << "\n"; 167 return 1; 168 } 169 170 return 0; 171 } 172